<template>
  <view>
    <view>
      <my-search-bar />
      <view class="scroll-view-container">
        <!-- 左边一级分类 -->
        <scroll-view
          scroll-y
          class="left-scroll-view"
          :style="{ height: h + 'px' }"
        >
          <view
            :class="[
              'left-scroll-view-item',
              currIndex === index ? 'active' : ''
            ]"
            v-for="(item, index) in categories"
            @click="currIndex = index"
            :key="item.cat_id"
          >
            {{ item.cat_name }}
          </view>
        </scroll-view>
        <scroll-view
          scroll-y
          class="right-scroll-view"
          :style="{ height: h + 'px' }"
        >
          <view v-for="item in level2List" :key="item.cat_id">
            <view class="cate-lv2-title">/ {{ item.cat_name }} /</view>
            <view class="cate-lv3-list">
              <view
                v-for="subitem in item.children"
                :key="subitem.cat_id"
                class="cate-lv3-item"
                @click="goToGoodsList(subitem)"
              >
                <image :src="subitem.cat_icon" mode="" />
                <text>{{ subitem.cat_name }}</text>
              </view>
            </view>
          </view>
        </scroll-view>
      </view>
    </view>
  </view>
</template>

<script>
export default {
  data () {
    return {
      categories: [],
      currIndex: 0,
      h: 0
    }
  },
  computed: {
    level2List () {
      return (
        this.categories[this.currIndex] &&
        this.categories[this.currIndex].children
      )
    }
  },
  onLoad (options) {
    this.getCategoriesData()
    this.h = uni.getSystemInfoSync().windowHeight - 50
  },
  methods: {
    async getCategoriesData () {
      const res = await uni.$resquest({
        url: 'categories'
      })
      if (res.meta.status === 200) {
        this.categories = res.message
        console.log(res)
        // this.cateLevel2 = res.message[this.currIndex].children
      }
    },
     goToGoodsList (item) {
      uni.navigateTo({
        url: '/subpkg/goods-list/index?query=' + item
      })
    }
  }
}
</script>
<style lang="scss" scoped>
.scroll-view-container {
  display: flex;

  .left-scroll-view {
    width: 240rpx;

    .left-scroll-view-item {
      line-height: 60px;
      background-color: #f7f7f7;
      text-align: center;
      font-size: 12px;

      // 激活项的样式
      &.active {
        background-color: #ffffff;
        position: relative;

        // 渲染激活项左侧的红色指示边线
        &::before {
          content: ' ';
          display: block;
          width: 3px;
          height: 30px;
          background-color: #c00000;
          position: absolute;
          left: 0;
          top: 50%;
          transform: translateY(-50%);
        }
      }
    }
  }
  .right-scroll-view {
    .cate-lv2-title {
      font-size: 12px;
      font-weight: bold;
      text-align: center;
      padding: 15px 0;
    }
    .cate-lv3-list {
      display: flex;
      flex-wrap: wrap;

      .cate-lv3-item {
        width: 33.33%;
        margin-bottom: 10px;
        display: flex;
        flex-direction: column;
        align-items: center;

        image {
          width: 60px;
          height: 60px;
        }

        text {
          font-size: 12px;
        }
      }
    }
  }
}
</style>
